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LNBH21 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. LNBH21
Description  LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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LNBH21 Datasheet(HTML) 1 Page - STMicroelectronics

 
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April 2004
s
COMPLETE INTERFACE BETWEEN LNB
AND I2CTM BUS
s
BUILT-IN DC/DC CONTROLLER FOR
SINGLE 12V SUPPLY OPERATION AND
HIGH EFFICIENCY (Typ. 94% @ 750mA)
s
TWO SELECTABLE OUTPUT CURRENT
LIMIT (450mA / 750mA)
s
BOTH COMPLIANT WITH EUTELSAT AND
DIRECT OUTPUT VOLTAGE
SPECIFICATION
s
ACCURATE BUILT-IN 22KHz TONE
OSCILLATOR SUITS WIDELY ACCEPTED
STANDARDS
s
FAST OSCILLATOR START-UP FACILITATES
DiSEqCTM ENCODING
s
BUILT-IN 22KHz TONE DETECTOR
SUPPORTS BI-DIRECTIONAL DiSEqCTM2.0
s
SEMI-LOWDROP POST REGULATOR AND
HIGH EFFICIENCY STEP-UP PWM FOR
LOW POWER LOSS: Typ. 0.56W @ 125mA
s
TWO OUTPUT PINS SUITABLE TO BYPASS
THE OUTPUT R-L FILTER AND AVOID ANY
TONE DISTORSION (R-L FILTER AS PER
DiSEqC 2.0 SPECs, see application circuit on
pag. 5)
s
CABLE LENGTH DIGITAL COMPENSATION
s
OVERLOAD AND OVER-TEMPERATURE
INTERNAL PROTECTIONS
s
OVERLOAD AND OVER-TEMPERATURE I2C
DIAGNOSTIC BITs
s
LNB SHORT CIRCUIT SOA PROTECTION
WITH I2C DIAGNOSTIC BIT
s
+/- 4KV ESD TOLERANT ON INPUT/
OUTPUT POWER PINS
DESCRIPTION
Intended for analog and digital satellite STB
receivers/SatTV, sets/PC cards, the LNBH21 is a
monolithic voltage regulator and interface IC,
assembled
in
POWER
SO-20,
specifically
designed to provide the 13/18V power supply and
the
22KHz
tone
signalling
to
the
LNB
downconverter in the antenna or to the multiswitch
box. In this application field, it offers a complete
solution with extremely low component count, low
power dissipation together with simple design and
I2CTM standard interfacing.
LNBH21
LNB SUPPLY AND CONTROL IC WITH
STEP-UP CONVERTER AND I2C INTERFACE
DSQIN
Enable
Preregul.+
U.V.lockout
+P.ON res.
V Select
Linear Post-reg
+Modulator
+Protections
Vup
VoRX
SDA
SCL
Vcc
Diagnostics
I²C interf.
Tone
Detector
DSQOUT
VoTX
DETIN
LNBH21
Byp
Gate
Sense
EXTM
ADDR
22KHz
Oscill.
TEN
Vup-Feedback
Step-up PWM
Controller
ISEL
BLOCK DIAGRAM
PowerSO-20


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